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Precision 7740

Dell Precision 7740 Reference guide

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Statement of Volatility – Dell 7740
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the
problem.
The Dell 7740 contains both volatile and non-volatile (NV) components. Volatile components lose their data immediately
after power is removed from the component. Non-volatile (NV) components continue to retain their data even after power is
removed from the component. The following NV components are present on the 7740’s system board.
Table 1. List of Non-Volatile Components on System Board
Description
Reference
Designator
Volatility Description
User
Accessible
for external
data
Remedial Action (Action necessary to
prevent loss of data)
Panel
EEDID
EEPROM
Part of panel
assembly
Non Volatile memory,
128bytes.
No
Part of the panel assembly
System
BIOS
UC5
Non Volatile memory, 256
Mbit (32 MB), System BIOS,
embedded controller and
Video BIOS for basic boot
operation, PSA (on board
diags), PXE diags.
No
N/A
System
Memory –
DDR4
memory
Four
SODIMM
connectors:
JDIMM1,2,3,4
present
Volatile memory in OFF state
One to Four modules must be
populated. System memory
size will depend on SODIMM
modules and up to 128 GB.
No
Power off the system
System
memory
SPD
EEPROM
On System
memory
SODIMM(s)
JDIMM1,2,3,4
present
Non Volatile memory 512
Bytes.
Stores memory manufacturer
data and timing information
for correct operation of system
memory.
No
N/A
RTC
CMOS –
BBRAM
(battery
backed up)
JRTC1
Non Volatile memory, 256
Bytes.
Stores CMOS information.
No
Remove the onboard coin cell
battery
Video
memory –
frame
buffer
For SG mode
sharing system
DDR4
For DSC mode
using DGFF
VRAM
Volatile memory in off state.
SG mode uses main system
memory size allocated out of
main memory.
Discrete graphics mode:
4GB GDDR5 for nVidia
N19P-Q3
No
Do not enter the S3-S5
State.
Description
Reference
Designator
Volatility Description
User
Accessible
for external
data
Remedial Action (Action necessary to
prevent loss of data)
6GB GDDR6 for nVidia
N19E-Q1
8GB GDDR6 for nVidia
N19E-Q3
16GB GDDR6 for nVidia
N19EQ5
8GB GDDR5 for AMD
WX7100-F16M-H1
Security
Controller
Serial
Flash
Memory
U2 (up-sell
USH
daughter
board)
Non Volatile memory, 32 Mbit
(4Mbyte)
No N/A
Hard
drive(s)
User
replaceable
Non Volatile magnetic media,
various sizes in GB. May also be
SSD (solid state flash drive) and
Hybrid HDD.
Yes
Low level format
TPM
Controller
UZ12
Non Volatile memory, 16K bytes
flash memory
No N/A
TYPE C PD
FW
embedded
in PD
controller
UT5
128 KB of embedded Flash
memory for PD controller
No N/A
Thunderbolt
controller
FW
UT2
Non Volatile memory, 8 Mbit
(1MB), Thunderbolt/type C
operation
No N/A
CAUTION: All other components on the system board lose data if power is removed from the system. Primary power loss
(unplugging the power cord and removing the battery) destroys all user data on the memory (DDR4, 2666/3200 MHz-XMP
config). Secondary power loss (removing the on-board coin-cell battery) destroys system data on the system configuration and
time-of-day information.
In addition, to clarify memory volatility and data retention in situations where the system is put in different ACPI power
states the following is provided (those ACPI power states are S0, S1, S3, S4 and S5):
S0 state is the working state where the dynamic RAM is maintained and is read/write by the processor.
S1 state is a low wake-up latency sleeping state. In this state, no system context is lost (CPU or chip set) and hardware
maintains all system contexts.
S3 is called “suspend to RAM” state or stand-by mode. In this state the dynamic RAM is maintained. Dell systems will be
able to go to S3 if the OS and the peripherals used in the system supports S3 state. Win8 support S3 state.
S4 is called “suspend to disk” state or “hibernate” mode. There is no power. In this state, the dynamic RAM is not
maintained. If the system has been commanded to enter S4, the OS will write the system context to a non-volatile storage
file and leave appropriate context markers. When the system is coming back to the working state, a restore file from the nonvolatile
storage can occur. The restore file has to be valid. Dell systems will be able to go to S4 if the OS and the peripherals
support S4 state. Win8 support S4 state.
S5 is the “soft” off state. There is no power. The OS does not save any context to wake up the system. No data will remain in
any component on the system board, i.e. cache or memory. The system will require a complete boot when awakened. Since
S5 is the shut off state, coming out of S5 requires power on which clears all registers.
The following table shows all the states supported by Dell Precision 7740:
Model Number
S0
S1
S3
S4
S5
Dell Precision
™
7740
X
X
X
X
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© 2013 Dell Inc.
Trademarks used in this text: Dell™, the DELL logo, Precision™ are trademarks of Dell Inc. Intel®, Pentium®, Xeon®, Core™ and Celeron® are
registered trademarks of Intel Corporation in the U.S. and other countries. Microsoft®, Windows® are either trademarks or registered trademarks of
Microsoft Corporation in the United States and/or other countries.
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